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//
//   http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.doris.nereids.trees.expressions.functions;

import org.apache.doris.nereids.trees.expressions.literal.Literal;

/** monotonicity for XX_DIFF */
public interface DateDiffMonotonic extends Monotonic {
    @Override
    default boolean isMonotonic(Literal lower, Literal upper) {
        return !(child(0) instanceof Literal) && child(1) instanceof Literal
                || child(0) instanceof Literal && !(child(1) instanceof Literal);
    }

    @Override
    default boolean isPositive() {
        return child(1) instanceof Literal;
    }

    @Override
    default int getMonotonicFunctionChildIndex() {
        return child(1) instanceof Literal ? 0 : 1;
    }
}
